Hubbell-Raco Incorporated 454942 Deep Steel Octagon Box, 3-1/2 by 1-1/2-Inch 3-1/2-Inch. Octagon Box, Drawn, Metallic Depth: 1-1/2" Side Knockouts: (4) 1/2" Bottom Knockouts: (1) 1/2". Cubic Inches: 11.8" Maximum Static Load: 50 lbs. It is 3-1/2 x 1-1/2 in. Deep Steel, Octagon Box It is 5 Each 1/2 in. Knockouts, 11.8 CUIN. N It is of It is 3-1/2 x 1-1/2 inch deep